Dhuni- the sacred fire, which Baba always kept burning. The ash from this fire was considered as udi and is distributed to the devotees.
Udi cured many physical and mental problems. Udi also has a material significance. It conferred health, prosperity, freedom from anxiety and many other worldly gains. Baba suggested many devotees to take udi to cure their problems, illness and many other problems. All this can be found in the holy epic Sai Satcharitra.